He "looked funny" whatever the hell that means.
Hi John, well, let's get the answer for that from the 'horse's mouth' :
"Mr BREWER - He just looked funny to me. Well, in the first place, I had seen him some place before. I think he had been in my store before. And when you wait on somebody, you recognize them, and he just seemed funny. His hair was sort of messed up and looked like he had been running, and he looked seared, and he looked funny." Now, in-its-self the above means absolutely zero..
untill it's put into context with the immediate surroundings. An officer had just been murdered a short distance away, police cars were racing up an down the street sirens blaring, as the police cars approached a man turns into the shop vestibule, once the cars pass the man leaves. Of course, none of this proves Oswald did anything wrong, that's not the point I'm trying to make. What I'm saying is that under those circumstances
and that Oswald appeared as if "His hair was sort of messed up and looked like he had been running, and he looked seared", any reasonable person's suspicions would be aroused just as Brewer's was. To be fair this post isn't particularly aimed at yourself, it's directed at the many who've claimed Brewer never had any reason to be suspicious of Oswald 'just for looking into his shop window'.